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    <title>CSS练习</title>
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h1 {
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<body>
  <header>
    <ul>
      <li>第一次练习</li>
      <li>CSS练习</li>
      <li><a href="../index.html">返回首页</a></li>
    </ul>
  </header>
  <!-- html 注释 -->
  <main>
    <div>
     <h1 style="text-align：right；">样式表的三种方式</h1>  
   <ul>
   <li>外部样式表</li>
   <li>内部样式表</li>
   <li>内嵌样式表</li>
  </ul>

  </div>
  <h1 id="box">盒模型</h1>
  <div class="box-model">
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